With airbags replacing the rear springs, you can go higher than you want. To the point of it looking dumb. LOL Most have about a 6-7 inch lift range from sitting on the tires.
Not much you can do to the front other than what you have. Unless you want to get into some real money spending. Your stock compressor may handle filling rear airbags occasionally. If your going to lift the whole car with air, it'* going to be expensive and a lot of work, Here'* a link to a system thats primitive, bare bones, and goes for $1800.
Mine with chrome airtank, dual chrome ViAir compressors, SS braided lines, computer controlled swithbox and digital gauge topped a little over $3k.
Rear airbags are stiffer and in my opinion more stable than coil springs. Especially in tight cornering and twisted roads.